Water is fundamental to sustaining life; yet, its quality is increasingly compromised by industrial activities, population growth, and urbanization, which collectively contribute significantly to water pollution. Among the pollutants released, heavy metals from industrial effluents, including chromium (Cr), lead (Pb), copper (Cu), nickel (Ni), mercury (Hg), and others are particularly concerning due to their high toxicity, persistence in the environment, and ability to bioaccumulate in living organisms even at low concentrations. Heavy metal contamination is one of the worst environmental issues facing the world today. The contamination of water resources with heavy metals not only threatens human health and ecosystems but also complicates efforts to manage industrial water resources sustainably. Their presence in water has been linked to various diseases and environmental degradation, making their detection and monitoring essential. This chapter examines the presence of heavy metal ions in industrial wastewater, outlining the sources and adverse effects of these pollutants on human health and the environment. It also provides an overview of conventional and advanced detection technologies used to monitor these pollutants, including their working principles and effectiveness in trace element analysis. Emphasis is placed on the need for improved water economy practices, such as recycling and reuse strategies, to reduce the discharge of heavy metals and safeguard water quality. The chapter concludes by advocating for innovative monitoring techniques and policy interventions to promote a sustainable water economy in industrial processes.